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GM Tech (Cam), Chevy Technician

Category: Chevy

Satisfied Customers: 15181

Experience: GM Grand Master Technician 2007. 14 years experience.

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Chevrolet Malibu LS: my 2001 Malibu 3.1 starts surging at about

Customer Question

my 2001 Malibu 3.1 starts surging at about 55mph with a loud humming noise from passenger front side. when cruise control on at this speed the loses rpm and has to downshift a gear to compensate. just replaced egr valve, but no difference.

I am sorry for the long waitare there any codes set in the computer at all ?when its making this noise if you turn to the right and then left with the steering wheel will turning the wheel to the right or left make the noise better or worse or change the noise ?

yes, there were throttle position sensor, egr valve, and oxygen sensor. replaced tps and egr, but now code just reads egr sensor. also the loud humming or howling noise does not matter when turning left or right.